由于环保日渐深入人心，柴油轿车为世人瞩目，特别是大众３Ｌ路波柴油轿车的上市，更为柴油机增添光彩，使一些不赞成发展柴油机的人的观点发生了根本性的转变。但有人仍然认为二冲机排气污染严重，噪声大，一些国家和地区已明令二冲程摩托车“下马”，改上四冲程车。雅马哈公 As environmental protection is gaining popularity in the public, diesel cars are attracting worldwide attention. In particular, the listing of VW’s 3L LPV sedan has further enhanced the diesel engine and fundamentally transformed some people who are not in favor of developing diesel engines. However, some people still think that the two machines have serious pollution and noisy air emissions. Some countries and regions have explicitly ordered two-stroke motorcycles to be “dismounted” and switched to four-stroke vehicles. Yamaha public